Reading this article about using QR codes in art, I realised that it might be possible to take a simple sprite from Jungle Journey and use it in a QR code. Fortunately, the author provided a convenient Web service (for which the source is available, which is nice), and I plugged a processed version of one of the enemy sprites into it to get this result.
Every time I see a QR code, or something similar, I think of game maps. I wonder if some interesting generated mazes could be displayed using these codes with their seed values encoded into the code itself.